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Nociception

Nociception

Nociception—the ability to feel pain—is essential for an organism’s survival and overall well-being. Noxious stimuli such as piercing pain from a sharp object, heat from an open flame, or contact with corrosive chemicals are first detected by sensory receptors, called nociceptors, located on nerve endings. Nociceptors express ion channels that convert noxious stimuli into electrical signals. When these signals reach the brain via sensory neurons, they are perceived as pain.

Somatosensation

Somatosensation

The somatosensory system relays sensory information from the skin, mucous membranes, limbs, and joints. Somatosensation is more familiarly known as the sense of touch. A typical somatosensory pathway includes three types of long neurons: primary, secondary, and tertiary. Primary neurons have cell bodies located near the spinal cord in groups of neurons called dorsal root ganglia. The sensory neurons of ganglia innervate designated areas of skin called dermatomes.

Pain

Pain

Pain serves as a critical warning signal that alerts the body to potential or actual harm. When mechanical pressure on the skin is intense, such as from a sharp pinch, the sensation transitions from touch to pain. Similarly, extreme temperatures, like a hot pot handle, convert the sensation of heat into pain. Pain can also result from overstimulation of other senses, such as blinding light, loud noise, or the intense heat from habañero peppers. This ability to sense pain is essential for...

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Analgesia and Pain Management

Pain is critical to various clinical pathologies, provoking an urgent need for effective management. Pain, whether acute or chronic, is a complex neurochemical process. Its alleviation depends on the type, with nonopioid analgesics effective for mild to moderate pain, such as musculoskeletal or inflammatory pain, while neuropathic pain responds best to anticonvulsants, tricyclic antidepressants, or serotonin/norepinephrine reuptake inhibitors. For severe acute or chronic pain, opioids may be...

Conditioned Taste Aversion

Conditioned Taste Aversion

Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
A notable characteristic of conditioned taste aversion is that it often requires only a single...

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Related Experiment Video

Updated: Oct 13, 2025

Investigating Pain-Related Avoidance Behavior using a Robotic Arm-Reaching Paradigm

Investigating Pain-Related Avoidance Behavior using a Robotic Arm-Reaching Paradigm

Published on: October 3, 2020

Disrupted population coding in the prefrontal cortex underlies pain aversion.

Anna Li¹, Yaling Liu², Qiaosheng Zhang¹

¹Department of Anesthesiology, Perioperative Care and Pain Medicine, New York University Grossman School of Medicine, New York, NY, USA; Interdisciplinary Pain Research Program, New York University Langone Health, New York, NY, USA.

|November 10, 2021

Summary

Chronic pain disrupts prefrontal cortex (PFC) neural activity and connectivity. Ketamine restores these functions, offering a potential therapeutic target for pain management.

Keywords:

PFC acute pain aversion inflammatory pain ketamine neural code pain population coding prefrontal cortex prelimbic

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Area of Science:

Neuroscience
Pain Research
Prefrontal Cortex Function

Background:

The prefrontal cortex (PFC) is crucial for sensory experience regulation.
Chronic pain can impair neural responses and increase aversion.
Understanding cortical nociceptive processing in chronic pain is limited.

Purpose of the Study:

To investigate population-level nociceptive processing in the prelimbic (PL) PFC.
To determine if chronic pain disrupts PFC neural activity and functional connectivity.
To evaluate ketamine's effect on PL-PFC function in an inflammatory pain model.

Main Methods:

In vivo endoscopic calcium imaging in freely behaving rats.
Monitoring neuronal population activity and functional connectivity in the PL-PFC.
Inducing inflammatory pain and administering ketamine.

Main Results:

Increased population activity in response to noxious stimuli was observed in the PL-PFC.
Stable functional connectivity among PL-PFC neurons was identified in healthy rats.
Inflammatory pain disrupted functional connectivity and reduced nociceptive responses.
Ketamine restored PL-PFC functional connectivity and produced anti-aversive effects.

Conclusions:

The PFC utilizes a dynamic resource allocation mechanism for pain representation.
Population activity in the PFC plays a critical role in pain regulation.
The PFC is a significant therapeutic target for pain management.